#include <stdio.h>
#include <stdlib.h>

int a[8];
char* day[] = {" ","MONDAY","TUESDAY","WEDENSDAY",
                "THURSDAY","FRIDAY","SATURDAY","SUNDAY"};
int main()
{
    int i,j,t;
    a[4] = 6;
    for(i = 1; i <= 3;i++)
    {
        a[i] = 2;
        if(!a[i+3]) 
        {
            a[i+3] = 7;
        }else{
            a[i] = 0;
            continue;
        }
        for(t = 1;t <= 3;t++)
        {
            if(!a[t]) 
            {
                a[t] = 5;
            }else{
                continue;
            }
            if(!a[t+2]) 
            {
                a[t+2] = 4;
            }else
            {
                a[t] = 0;
                continue;
            }
            for(j = 5; j < 7;j++)
            {
                if(!a[j])
                {
                    a[j] = 3;
                }else{
                    continue;
                }
                if(!a[j+1])
                {
                    a[j+1] = 1;
                }else{
                    a[j] = 0;
                    continue;
                }
                for(i = 1;i <= 7; i++)
                {
                    printf("Doctor %c id on duty %s.\n",'A'+a[i]-1,day[i]);
                
                }
                exit(0);
            }
        }


    }
    return 0;
}
//熊贤豪
